<template>
   <div>
      <!-- 面包屑导航区区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片 -->
      <el-card>
         <!-- 头部的警告区域 -->
         <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
         </el-alert>

         <!-- 选择商品分类区域 -->
         <el-row class="cat_opt">
            <el-col>
               <span>选择商品分类：</span>
               <!-- 选择商品分类的级联选择框 -->
               <!-- <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange"
                  clearable>
               </el-cascader> -->
               <el-cascader v-model="selectedCateKeys" :options="catelist"
                  :props="{ expandTrigger: 'hover', ...cateProps }" @change="handleChange" clearable>
               </el-cascader>
            </el-col>
         </el-row>

         <!-- tab页签区域 -->
         <el-tabs v-model="activeName" @tab-click="handleTabClick">

            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
               <!-- 添加参数的按钮 -->
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数
               </el-button>
               <!-- 动态参数表格 -->
               <el-table :data="manyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                     <!-- 循环渲染tag标签 -->
                     <template v-slot="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable
                           @close="handleClose(i, scope.row)">
                           {{ item }}
                        </el-tag>
                        <!-- 输入的文本框 -->
                        <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                           ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                           @blur="handleInputConfirm(scope.row)">
                        </el-input>
                        <!-- 添加按钮 -->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                        </el-button>
                     </template>
                  </el-table-column>

                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作" prop="attr_name">
                     <template v-slot="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑
                        </el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
                     </template>
                  </el-table-column>
               </el-table>
            </el-tab-pane>

            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
               <!-- 添加属性的按钮 -->
               <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性
               </el-button>
               <!-- 静态参数表格 -->
               <el-table :data="onlyTableData" border stripe>
                  <!-- 展开行 -->
                  <el-table-column type="expand">
                     <el-table-column type="expand">
                        <!-- 循环渲染tag标签 -->
                        <template v-slot="scope">
                           <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable
                              @close="handleClose(i, scope.row)">
                              {{ item }}
                           </el-tag>
                           <!-- 输入的文本框 -->
                           <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                              ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                              @blur="handleInputConfirm(scope.row)">
                           </el-input>
                           <!-- 添加按钮 -->
                           <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                           </el-button>
                        </template>
                     </el-table-column>
                  </el-table-column>
                  <!-- 索引列 -->
                  <el-table-column type="index"></el-table-column>
                  <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                  <el-table-column label="操作" prop="attr_name">
                     <template v-slot="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
                     </template>
                  </el-table-column>
               </el-table>
            </el-tab-pane>
         </el-tabs>
      </el-card>

      <!-- 添加参数的对话框 -->
      <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
         <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
               <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
         </span>
      </el-dialog>

      <!-- 修改参数的对话框 -->
      <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
         <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
               <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
         </el-form>
         <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
         </span>
      </el-dialog>
   </div>
</template>

<script>
export default {
   name: 'Params',
   data() {
      return {
         // 商品分类类别
         catelist: [],
         // 级联选择框的配置对象
         cateProps: {
            value: 'cat_id',
            label: 'cat_name',
            children: 'children'
         },
         // 级联选择框双向绑定到的数组
         selectedCateKeys: [],
         // 被激活的页签的名称
         activeName: 'many',
         // 动态属性的数据
         manyTableData: [],
         // 静态属性的数据
         onlyTableData: [],
         // 控制添加对话框的显示与隐藏
         addDialogVisible: false,
         // 添加表单的数据对象
         addForm: {
            attr_name: '',

         },
         // 添加表单的验证规则对象
         addFormRules: {
            attr_name: [
               {
                  required: true, message: '请输入参数名称', trigger: 'blur'
               }
            ]
         },
         // 控制修改对话框的都显示与隐藏
         editDialogVisible: false,
         // 修改的表单数据对象
         editForm: {},
         // 修改表单的验证规则对象
         editFormRules: {
            attr_name: [
               {
                  required: true, message: '请输入参数名称', trigger: 'blur'
               }
            ]
         },
         // 控制按钮与文本框的切换显示
         inputVisible: false,
         // 文本框中输入的内容
         inputValue: ''
      }
   },
   methods: {
      // 获取商品分类数据
      async getCateList() {
         const { data: res } = await this.$http.get('categories')
         if (res.meta.status != 200) {
            return this.$message.error('获取商品分类失败！')
         }
         console.log(res.data);
         // 把数据列表，赋值给catelist 
         this.catelist = res.data
      },

      // 级联选择框选中变化，会触发这个函数
      handleChange() {
         this.getParamsData()
      },
      // Tab页签点击事件的处理函数
      handleTabClick() {
         // console.log(this.activeName);
         this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData() {
         // 证明选中的不是三级分类
         if (this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            this.manyTableData = []
            this.onlyTableData = []
            return
         }
         // 证明选中的是三级分类
         // console.log(this.selectedCateKeys);
         // 根据所选分类的Id，和当前所处的面板，获取对应的参数
         const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
         if (res.meta.status != 200) {
            return this.$message.error('获取参数列表失败！')
         }
         // console.log(res.data);

         res.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            // 控制文本框的显示与隐藏
            item.inputVisible = false
            item.inputVisible = ''
         })


         console.log(res.data);
         if (this.activeName === 'many') {
            this.manyTableData = res.data
         } else {
            this.onlyTableData = res.data
         }
      },
      // 添加对话框的关闭事件
      addDialogClosed() {
         this.$refs.addFormRef.resetFields()
      },
      // 点击按钮，添加参数
      addParams() {
         this.$refs.addFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
            // console.log(res);
            if (res.meta.status != 201) {
               return this.$message.error('获取参数列表失败！')
            }
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
         })
      },
      // 点击按钮展示修改的对话框
      async showEditDialog(attr_id) {
         const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
         if (res.meta.status != 200) {
            return this.$message.error('获取参数信息失败！')
         }
         this.editForm = res.data
         // console.log(this.editForm);
         this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed() {
         this.$refs.editFormRef.resetFields()
      },
      // 点击确定修改参数信息
      editParams() {
         this.$refs.editFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
            console.log(res);

            if (res.meta.status != 200) {
               return this.$message.error('修改参数失败！')
            }
            this.$message.success('修改参数成功！')
            this.getParamsData()
            this.editDialogVisible = false
         })

      },
      // 根据id删除对应的参数信息
      async removeParams(attr_id) {
         const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
         }).catch(err => err)

         if (confirmResult !== 'confirm') {
            return this.$message.info('已取消删除！')
         }

         // 删除的业务逻辑
         const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
         if (res.meta.status != 200) {
            return this.$message.error('删除参数失败！')
         }
         this.$message.success('删除参数成功！')
         this.getParamsData()
      },
      // 文本框失去焦点，或摁下了Enter都会触发
      async handleInputConfirm(row) {
         if (row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
            return
         }
         // 如果没有return 则证明输入的内容，需要做后续处理
         row.attr_vals.push(row.inputValue.trim())
         row.inputValue = ''
         row.inputVisible = false
         this.saveAttrVals(row)



      },
      // 将对attr_vals的操作 保存到数据库
      async saveAttrVals(row) {
         //需要发起请求，保存这次操作
         const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })

         if (res.meta.status != 200) {
            return this.$message.error('修改参数失败！')
         }
         this.$message.success('修改参数成功！')
      },
      // 点击按钮展示文本输入框
      showInput(row) {
         row.inputVisible = true
         // 让文本框自动获得焦点
         // $nextTick方法的作用，就是当页面上元素被重新渲染之后,才会指定回调函数中的代码
         this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
         });
      },
      // 删除对应的参数可选项
      handleClose(i, row) {
         row.attr_vals.splice(i, 1)
         this.saveAttrVals(row)
      }
   },
   computed: {
      // 如果按钮需要被禁用，则返回true,否则返回false
      isBtnDisabled() {
         if (this.selectedCateKeys.length !== 3) {
            return true
         }
         return false
      },
      // 当前选中的三级分类的Id
      cateId() {
         if (this.selectedCateKeys.length === 3) {
            return this.selectedCateKeys[2]
         }
         return null
      },
      // 动态计算标题的文本
      titleText() {
         if (this.activeName === 'many') {
            return '动态参数'
         }
         return '静态参数'
      },

   },
   created() {
      this.getCateList()
   },
}
</script>

<style lang="less" scoped>
.cat_opt {
   margin: 15px 0;
}

.el-tag {
   margin: 10px;
}

.input-new-tag {
   width: 120px;
}
</style>